Slip-ring assembly with short-circuiting contact



H. RICHTER SLIP RING ASSEMBLY WITH SHORT cnzcurrme CONTACT Dec. 18, 1928.

Filed Oct. 1, 1926 INVENTOR Hams Ric/z fer WITNESSES:

' ATTORNEY f ii) Patented Dec. 1a, 1928,.

UNITED STATES PATENT OFFICE.

wnsrmenousn 'mmc'rnro & MANUFACTURING COMPANY, a CORPORATION or PENNSYLVANIA.

sLm-BING ASSEMBLY wrrn SHORT-CIRCUITING CONTACT.

Application fled October 1, 1926, Serial No. 188,911, andjin Germany October 8, 1825. I

such motors.

An object of my invention is, to IOVldB novel short-circuiting contact members 0 form for the slip rings of the secondary winding of an induction motor.

Another object of my invention is to pro vide a device which permits the exchange of a burnt contact member without disassembhng the device, even inthose cases in which a disengageable connection between the contact member and its associated conductor can i not be used because of lack of room. I My present device distinguishes from prior.

short-circuiting devices in aving conductors which are .led through the slip-ring supporting member to the shortcircuit contact members, each of said conductors having a shortcircuiting contact member at one endand being connected at the other end to the conductor from a slip-ring by means of a-disengageable connection, preferably a screw connection, which also engages a lead from the secondary winding of the motor.

With the foregoing and other objects in view, my invention consists in the details and combinations described and claimed in this specification, and illustrated in the accome panying drawing, wherein p Fig. 1 is a fragmentary lon 'tudinal sectional view of the slip-ring end of an induction motor embodying my invention.

Fig. 2 is a detail view of one of the specia conductors of my invention, and I F i s. 3 and 4 are detail sectional views on the lines IIIIII and IV-IV, respectively, of Fig. 1.

As shown in Fig. 1, my invention is applied to an induction motor com rising a stator member 5 and a rotor mem er 6, the stator member being provided with bearings 7 for sup orting the rotor member. The

rotor mem er comprises secondary windings 8 which are provided minal leads 9. I

A plurality of slip-rings 11, 12 and 13 are provided at one end of the rotor member 6, the said slip-rings beingimounted upon a with a plurality of ters supporting member 14 adjacent to one of the bearings 7. The supporting member 14 is provided with a layer 15 of insulation mounted thereon under the slip-rings 1 1, 12

and 13, and the slip-rings are further insulated by insulating rings 16, 1'7 and 18, adjacent thereto. i

A plurality of contact members 21 are disposed at the end of the sup'portingmember nearest the adjacent bearing 7. The contact members 21 are carried by conducting leads 22' projecting through suitable rooves or recesses 23 in the supportin mem?) spring member 24 is provided between each of the contact members 21'and its conducting lead 22.

The so veralslip-rings 11, 12 and 13 are providedwith leads 26 extending through the same grooves 23 as are occupied by the conducting leads 22 of the shortcircuiting contact members. Each ofthe leads 26 is soldered or otherwise secured to one of the slip rings, as indicated at 28 in Fig. 4, the lead beinginsulated from the remaining slip-rings, as indicated in Fig. 3. Q

Preferably, also, the several conducting leads 26 of the slip-rings and the respective conducting leads 22 of the contact members er 14. A

are nested in pairs, the one within the other,

the outer lead ofeach pair being of channel section to receive the nested lead, as indicated in Figs. 3 and 4. By this arrangement,

if the short-circuiting members are not desired, they can be simply removed without I necessitating any change whatsoever in the conducting leads 26 of the slip-rings.

The conducting leads 22 and 26 terminate at the side of the supporting member 14 furthest from the adjacent bearing 7 and are detachably connected together in pairs and to the corresponding leads 9 of the rotor member by means of suitable removable connecting means illustrated in the form of bolts 29.

' The short-circuiting contact members 21 are adapted to be engaged by an axially'movable short-circuiting ring 31, said short-circuiting ring being disposed over a portion of the adjacent bearing 7 in its open-circuit position. Preferably, also, I provide springpressed detents 32, mounted in the supporting member l l, for engaging depressions 33 in the short-circuiting ring 31, for the purose of holding the same against accidental isplacement while it is in short-circuiting position surrounding the contact members 21. By virtue of the construction hereinabove described, it will be noted that if one of the contact members 21 becomes burnt, the adjaloosene I and the chi e01 toge'her "111th onduetlng;

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